(Ordnance Survey map grid reference SY 583871 , 1.5 miles NW of Portesham, 1.5 miles NNE of Abbotsbury, near the Dorset coast NW of Weymouth.)
"The Grey Mare And Her Colts" is a badly overgrown barrow, and is one of the simpler forms of communal tomb concentrated in the Cotswolds / Wessex area. It is in an area which is extraordinarily rich in prehistoric remains... if you look at the map of the area (linked to above) there are numerous tumuli, hut circles, barrows and stones shown on it.
This barrow contains the remains of a single rectangular stone burial chamber of sarsen stones set at the south-eastern end of a long barrow. The chamber, which was originally roofed by a capstone, now fallen, opens directly on to a shallow concave forecourt defined by upright stones placed at the end of the barrow mound.
The barrow itself, which would originally have covered the stones of the chamber, was about 75 feet long and 40 feet wide at the SE end, but general erosion and agricultural use of the land has reduced its visible size. It now has a maximum height of about 3 to 4 feet.
The Grey Mare And Her Colts probably dates from around 4000BC.
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